Make GHCup isolate installs non-overwriting by default

ghcup's behavior for cabal / hls / stack now in isolated installs is overwriting. This MR changes that to non-overwriting.

if file already exists at the given isolated location, it will error and report so.

mentioned in issue #210 (closed)

We're duplicating these two lines everywhere, so I'd argue we don't want checkFileAlreadyExists, but throwFileAlreadyExists.

so we just repeat 1 line everywhere? : p

we just write throwFileAlreadyExists filepath and it will do nothing if file doesn't exist but throws an Exception if it does ?

yes

changed this line in version 2 of the diff

added 1 commit

• df758d82 - swap checkFileAlreadyExists with throwIfFileAlreadyExists

Compare with previous version

did.

merged